The seriousness of his tone leaves Toriel feeling grim. She reaches out to stroke her fingers across his cheek gently, a wordless promise therein. Knowing what she does now, the boss monster is a little afraid of what her son did in response to all this death.

"Asriel, I will never hate you... Please, tell me what happened?" She will be disappointed, disgusted, frightened- but Toriel cannot hate her son. He is only a child, a child the world has treated so unfairly. A child who needs love to counteract all the self hatred he carries.